Auto hammer



FIG. 1 is a left side elevational view of an auto hammer showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a perspective view thereof.

The broken lines shown in the drawings illustrate portions of the auto hammer that forms no part of claimed design. 

CLAIM What is claimed is the ornamental design for an auto hammer, as shown and described. 